From Academic Kids
High tech refers to "high technology," technology that is at the cutting-edge and the most advanced currently available. The adjective form is hyphenated: high-tech.
Because the high-tech sector of the economy develops or uses the most advanced technology known, it is often seen as having the most potential for future growth. This perception has led to high investment in high-tech sectors of the economy. High-tech startup enterprises receive a large portion of venture capital. However, if, as has happened in the past, investment exceeds actual potential, then investors can lose all or most of their investment. High tech is often viewed as high-risk, but offering the opportunity for high profits.